internal/thumbs is internal/media, with Inspect: what a file holds, from ffprobe

The package was named for its first job; it now also decides what a file is for the
Files tab (image, video, audio) and reads its streams, which the viewer will need. Inspect
is the richer probe — codec, profile, pixel format, size, frame rate, HDR transfer, the
audio beside it, container and duration — run as root through sudo when asked.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

internal/files/files.go

@@ -25,7 +25,7 @@ import (
 	"time"
 
 	"hamlab/internal/priv"
-	"hamlab/internal/thumbs"
+	"hamlab/internal/media"
 )
 
 type Entry struct {
@@ -152,7 +152,7 @@ func entryOf(dir, name string, lst os.FileInfo) Entry {
 		e.Type = "other"
 	}
 	if e.Type == "file" || (e.Type == "link" && !e.Broken) {
-		e.Preview = thumbs.Kind(name)
+		e.Preview = media.Kind(name)
 	}
 	return e
 }